Found my first problems with this today. The ZFS mirror appears to work fine, but if you disconnect one of the iSCSI targets it hangs for 5 mins or more. I'm also seeing very concerning behaviour when attempting to re-attach the missing disk.
My test scenario is: - Two 35GB iSCSI targets are being shared using ZFS shareiscsi=on - They are imported to a 3rd Solaris box and used to create a mirrored ZFS pool - I use that to mount a NFS share, and connected to that with VMware ESX server My first test was to clone a virtual machine onto the new volume. That appeared to work fine, so I decided to test the mirroring. I started another clone operation then powered down one of the iSCSI targets. Well, the clone operation seemed to hang as soon as I did that, so I ran "zpool status" to see what was going on. The news wasn't good: That hung too. Nothing happened in either window for a good 5 minutes, then ESX popped up with an error saying "the virtual disk is either corrupted or not a supported format", and at the exact same time the zpool status command completed, but showing that all the drives were still ONLINE. I immediately re-ran zpool status, now it reported that one iSCSI was now offline and the pool was running in a degraded state. So, for some reason it's taken 5 minutes for the iSCSI device to go offline, it's locked up ZFS for that entire time, and ZFS reported the wrong status the first time around too. The only good news is that now that ZFS is in a degraded state I can start the clone operation again and it completes fine with just half of the mirror available. Next, I powered on the missing server, checked "format < /dev/null" to ensure the drives had re-connected, and used "zpool online" to re-attach the missing disk. So far it's taken over an hour to attempt to resilver files from a 10 minute copy, and the progress report is up and down like a yo-yo. The progress reporting from ZFS so far has been: - 2.25% done, 0h13m to go - 7.20% done, 0h12m to go - 6.14% done, 0h8m to go (odd, how does it go down?) ... - 78.50% done, 0h2m to go - 41.67% done, 0h8m to go (huh?) ... - 72.45% done, 0h3m to go - 42.42% done, 0h9m to go Getting concerned now, I'm actually wondering if this is ever going to complete, and I have no idea if these problems are ZFS or iSCSI related. This message posted from opensolaris.org _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
